Geologic-seismic models,prediction of shallow-water lacustrine delta sandbody and hydrocarbon potential in the Late Miocene,Huanghekou Sag,Bohai Bay Basin,northern China

作     者：Hao Liu Qing-Long Xia Xin-Huai Zhou 

作者机构：School of Ocean Sciences China University of Geosciences Exploration & Exploitation Research Institute Tianjin Branch of China National Offshore Oil Corporation Exploration & Exploitation Research Institute Shanghai Branch of China National Offshore Oil Corporation 

出 版 物：《Journal of Palaeogeography》 (古地理学报（英文版）)

年 卷 期：2018年第7卷第1期

页      面：66-87页

核心收录：

学科分类：07[理学] 

基　　金：funded by the National Science and Technology Major Project(Exploration Technologies for Offshore Hidden Oil/Gas)(Project No.:2016ZX05024003-003) 

主　　题：Shallow-water lacustrine delta High-frequency sequence Root-mean-square(RMS)amplitude Geological-geophysical model Sandstone depiction Huanghekou Sag Late Miocene 

摘      要：The Huanghekou Sag is located at the southeast part of the Bohai Bay Basin, northern China. Large-scale shallow lake delta developed in the Neogene provided suitable geological conditions for the formation of a subtle oil-gas reservoir in this area. The key for analyzing sandstone reservoir and sedimentary facies is by using seismic attributes(amplitude) to establish the relationship between lithology combination and seismic attributes. The lower unit of Late Miocene Minghuazhen Formation at the BZ34 block in the Huanghekou Sag was subdivided into 10 parasequence sets(PSS). Thicker sandstones mainly occurred in PSS1 and PSS10, whereas thin sandstones are mostly observed within other parasequence sets. This study presents statistics and analyses of lithology, i.e., statistics of root-meansquare(RMS) amplitude and lithology of well locations in different parasequence sets of the study area,as well as 1-D forward seismic models of 7 types of lithology combinations, the establishment of a spatial distribution of 2-D sandbody, forward seismic models etc. Our study indicates that high amplitude peaks correspond to thicker sandbodies, while low amplitude indicates non-development of sandbodies(generally less than 2 m), and medium amplitude agrees well with large sets of mudstones interbedded with medium and thinner sandstones. Different sand-mudstone combinations genetically reflect a combination of multiple micro-facies, therefore, amplitude features can predict sandbodies as well as facies characteristics.